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분리유한요소법과 ILU 예조건화 기법을 이용한 3차원 난류 유동해석
안영규(Youngkyoo Ahn),최형권(Hyoung Gwon Choi),용호택(Ho-Taek Yong) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
A segregated finite element method based on SIMPLE algorithm has been developed in order to solve three dimensional flows around a blunt body. This study is the extension of the two dimensional segregated finite element algorithm proposed by Choi & Yoo (1994). For the validation of the algorithm, steady flows around a sphere are solved at various Reynolds numbers. The results agree well with the existing numerical and experimental results. For the analysis of turbulent flow, κ-ω model is adopted for the present algorithm. The turbulence model is tested by solving a pipe flow at Re = 40,000. Lastly, turbulent flows around an Ahmed model are solved for various shapes and the results are compared with the existing experimental and numerical results.
고체열원을 포함한 밀폐된 공동 내의 복합열전달에 대한 연구
안영규(Youngkyoo Ahn),최형권(Hyoung-gwon Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In the present study, a conjugate heat transfer problem inside a cavity with a solid body, where constant heat flux is generated, is investigated. A conduction heat transfer problem inside the solid body is automatically coupled with natural convection inside the cavity by using a finite element formulation. A SIMPLE type algorithm is adopted for the finite element solution of the incompressible Navier-Stokes equation. Effect of various parameters including the position, intensity and material property of the solid body on the heat transfer characteristic inside the cavity is numerically studied by examining temperature and velocity fields.
ANSYS Fluent를 이용한 Lithium-ion Battery 해석
안영규(Youngkyoo Ahn) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In a xEV system, a battery pack is composed of numerous battery cells and the performance, life and safety of a battery is very sensitive to temperature. Heat arises due to ambient environment, joule heating and electro-chemistry and the thermal management of battery cell is very important. ANSYS Fluent provides three kinds of electro-chemistry models for lithium-ion battery simulations. This paper introduces the numerical model approach method by solving NTGK Empirical Model<SUP>(5)~(7)</SUP>, Equivalent Circuit Model<SUP>(10)</SUP>, and Newman electrochemistry Model<SUP>(1),(2)</SUP> available in ANSYS Fluent. For the validation of the model, a single battery cell is solved at various conditions. The results well agreed with the existing numerical and experimental results. An additional co-simulation analysis was carried out to predict the thermal state inside of the battery pack due to the electrochemistry, fluid flow, and thermal conditions.
고체 열원이 존재하는 공동 내의 복합열전달 문제의 유한요소해석
안영규(Youngkyoo Ahn),최형권(Hyoung-gwon Choi),용호택(Hotaek Yong) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.3
In the present study, a finite element analysis of conjugate heat transfer problem inside a cavity with a heatgenerating conducting body, where constant heat flux is generated, is conducted. A conduction heat transfer problem inside the solid body is automatically coupled with natural convection inside the cavity by using a finite element formulation. A finite element formulation based on SIMPLE type algorithm is adopted for the solution of the incompressible Navier-Stokes equations coupled with energy equation. The proposed algorithm is verified by solving the benchmark problem of conjugate heat transfer inside a cavity having a centered body. Then a conjugate natural heat transfer problem inside a cavity having a heat-generating conducting body with constant heat flux is solved and the effect of the Rayleigh number on the heat transfer characteristics inside a cavity is investigated.
Taylor-Galerkin/level-set 방법을 이용한 자유 표면의 병렬 유한요소 해석
안영규(Youngkyoo Ahn),최형권(Hyoung-gwon Choi),조명환(Myung-hwan Cho),유정열(Jung-yul Yoo) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In the present study, a parallel Taylor-Galerkin/level set based two-phase flow code was developed using finite element discretization and domain decomposition method based on MPI (Message Passing Interface). The proposed method can be utilized for the analysis of a large scale free surface problem in a complex geometry due to the feature of FEM and domain decomposition method. Four-step fractional step method was used for the solution of the incompressible Navier-Stokes equations and Taylor-Galerkin method was adopted for the discretization of hyperbolic type redistancing and advection equations. A Parallel ILU(0) type preconditioner was chosen to accelerate the convergence of a conjugate gradient type iterative solvers. From the present parallel numerical experiments, it has been shown that the proposed method is applicable to the simulation of large scale free surface flows.